title: Ardnamurchan 3D cone-sheet architecture explained by a single elongate magma chamber.
abstract: The Palaeogene Ardnamurchan central igneous complex, NW Scotland, was a defining place for the development of the classic concepts of cone-sheet and ring-dyke emplacement and has thus fundamentally influenced our thinking on subvolcanic structures. We have used the available structural information on Ardnamurchan to project the underlying three-dimensional (3D) cone-sheet structure. Here we show that a single elongate magma chamber likely acted as the source of the cone-sheet swarm(s) instead of the traditionally accepted model of three successive centres. This proposal is supported by the ridge-like morphology of the Ardnamurchan volcano and is consistent with the depth and elongation of the gravity anomaly underlying the peninsula. Our model challenges the traditional model of cone-sheet emplacement at Ardnamurchan that involves successive but independent centres in favour of a more dynamical one that involves a single, but elongate and progressively evolving magma chamber system.
authors.affiliation: Department of Earth Sciences, CEMPEG, Uppsala University, Villavägen 16, 75236 Uppsala, Sweden.
authors.forename: Steffi
authors.initials: S
authors.lastname: Burchardt
authors.forename: Valentin R
authors.initials: VR
authors.lastname: Troll
authors.forename: Lucie
authors.initials: L
authors.lastname: Mathieu
authors.forename: Henry C
authors.initials: HC
authors.lastname: Emeleus
authors.forename: Colin H
authors.initials: CH
authors.lastname: Donaldson